Since corn is now being harvested, we've decided to put our ear to the ground and investigate some corns that crop up in the lexicon.
We begin by distinguishing between sweet corn, also called sugar corn, and starch corn. The sweet and sugary labels refer to the tasty edible corn that feature kernels containing a high percentage of sugar in the milk stage, when they're suitable for eating. When corn is in "the stage suitable for eating"—or to be precise, when sweet corn is just ripe enough to be eaten—it is known by the Southern name mutton corn. After those roasting ears are past their peak, the once-delectable kernels turn horny, translucent, and wrinkled.
Speaking of wrinkled, don't think we forgot about starch corn. Starch corn actually is not corn at all, but another name for the spiked wheat that resembles corn and is better known as spelt.
Starch corn isn't the only corn name that doesn't grow on the cob. Corn snow names a granular snow that is formed by alternate thawing and freezing; squirrel corn is a type of herb; and corned beef takes its name from the verb corn that means "to preserve or season with salt in grains." What's the connection between the verb and the noun corn? Quite a bit. Both terms have linguistic ancestors in the Old English word for grain.